From: Eric Sunshine <sunshine@sunshineco.com>
To: Johannes Schindelin <johannes.schindelin@gmx.de>
Cc: Git List <git@vger.kernel.org>, Ben Wijen <ben@wijen.net>,
Junio C Hamano <gitster@pobox.com>,
Lars Schneider <larsxschneider@gmail.com>
Subject: Re: [PATCH 2/2] mingw: ensure temporary file handles are not inherited by child processes
Date: Wed, 17 Aug 2016 08:48:37 -0400 [thread overview]
Message-ID: <CAPig+cR4=kEUb5PsZfoz3=W+R61wER=vHos5uX02kEVM8YETgA@mail.gmail.com> (raw)
In-Reply-To: <77e7c4e4de6c45a1b24bb4d08ca20a1385f43444.1471437637.git.johannes.schindelin@gmx.de>
On Wed, Aug 17, 2016 at 8:41 AM, Johannes Schindelin
<johannes.schindelin@gmx.de> wrote:
> When the index is locked and child processes inherit the handle to
> said lock and the parent process wants to remove the lock before the
> child process exits, on Windows there is a problem: it won't work
> because files cannot be deleted if a process holds a handle on them.
> The symptom:
>
> Rename from 'xxx/.git/index.lock' to 'xxx/.git/index' failed.
> Should I try again? (y/n)
>
> Spawning child processes with bInheritHandles==FALSE would not work
> because no file handles would be inherited, not even the hStdXxx
> handles in STARTUPINFO (stdin/stdout/stderr).
>
> Opening every file with O_NOINHERIT does not work, either, as e.g.
> git-upload-pack expects inherited file handles.
>
> This leaves us with the only way out: creating temp files with the
> O_NOINHERIT flag. This flag is Windows-specific, however. For our
> purposes, it is equivalent our purposes) to O_CLOEXEC (which does not
s/our purposes)//
> exist on Windows), so let's just open temporary files with the
> O_CLOEXEC flag and map that flag to O_NOINHERIT on Windows.
>
> This fixes the test that we just introduced to demonstrate the problem.
>
> Signed-off-by: Ben Wijen <ben@wijen.net>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
next prev parent reply other threads:[~2016-08-17 12:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 12:40 [PATCH 0/2] Do not lock temporary files via child processes on Windows Johannes Schindelin
2016-08-17 12:40 ` [PATCH 1/2] t6026-merge-attr: child processes must not inherit index.lock handles Johannes Schindelin
2016-08-17 17:55 ` Junio C Hamano
2016-08-17 12:41 ` [PATCH 2/2] mingw: ensure temporary file handles are not inherited by child processes Johannes Schindelin
2016-08-17 12:48 ` Eric Sunshine [this message]
2016-08-18 14:42 ` Johannes Schindelin
2016-08-17 13:14 ` Lars Schneider
2016-08-17 18:22 ` Junio C Hamano
2016-08-18 14:50 ` Johannes Schindelin
2016-08-18 17:35 ` Eric Wong
2016-08-18 21:53 ` Junio C Hamano
2016-08-18 22:48 ` Eric Wong
2016-08-19 15:57 ` Junio C Hamano
2016-08-22 12:47 ` Johannes Schindelin
2016-08-18 14:51 ` [PATCH v2 0/2] Do not lock temporary files via child processes on Windows Johannes Schindelin
2016-08-18 14:51 ` [PATCH v2 1/2] t6026-merge-attr: child processes must not inherit index.lock handles Johannes Schindelin
2016-08-18 14:51 ` [PATCH v2 2/2] mingw: ensure temporary file handles are not inherited by child processes Johannes Schindelin
2016-08-22 12:47 ` [PATCH v3 0/2] Do not lock temporary files via child processes on Windows Johannes Schindelin
2016-08-22 12:47 ` [PATCH v3 1/2] t6026-merge-attr: child processes must not inherit index.lock handles Johannes Schindelin
2016-08-22 12:47 ` [PATCH v3 2/2] mingw: ensure temporary file handles are not inherited by child processes Johannes Schindelin
2016-08-22 17:58 ` Eric Wong
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